Enhanced performance of 1D ZnMn2O4 nanofibers for symmetric supercapacitor device

We successfully synthesized one-dimensional (1D) ZnMn2O4 nanofibers using the electrospinning method. FESEM images revealed the formation of tightly wound, minuscule fibers with continuous chains, confirming the successful fabrication of uniform nanofibers. The atomic percentages of Zn, Mn, and O in the ZnMn2O4 nano- fibers were quantified using EDX analysis, and the composition and surface elemental states were verified through XPS measurements. Raman spectroscopy recorded six distinct vibrational modes of ZnMn2O4, further confirming the material's structural integrity. Surface wettability assessed by contact angle measurements, which showed hydrophilic nature of optimized electrode that enhances electrolyte ion penetration and facilitates redox reactions over a larger surface area. Electrochemical testing in KOH electrolyte revealed a specific capacitance of 2027F/g at 5 mV/s. Furthermore, a flexible symmetric supercapacitor device demonstrated impressive specific energy (532 Wh/kg) and specific power (86 kW/kg) at 2 mA/cm2, highlighting the potential for wearable electronics. These findings suggest that electrospun ZnMn2O4 nanofibers are highly promising for highperformance, durable and flexible energy storage applications.